Internal winding mandrel



June 21, 1960 J. T. YOVANOVICH 2,941,453

INTERNAL WINDING MANDREL Filed July 9, 1957 5 Sheets-Sheet 1 INVENTOR.

June 21, 1960 .1. T. YOVANOVICH INTERNAL WINDING MANDREL Filed July 9, 1957 5 Sheets-Sheet 2 r r Er r INVENTOR.

JOSEPH z YOVAIVOV/(W BY June 21, 1960 J. T. YOVANOVICH INTERNAL WINDING MANDREL 5 Sheets-Sheet 3 Filed July 9, 1957 k v k.

M R W NR W v .0 k a Y Mx f w A 9% w J P V @N 9 an Q m. a w s h Nu June 21, 1960 J. T. YOVANOVICH 2,941,453

INTERNAL WINDING MANDREL Filed July 9, 19s? 5 Sheets-Sheet 4 \v llllnllllllunzyln INVENTOR. JOJf/H 7. YOW/VOV/Cfl y y/W 14 TTOKWE) June 21, 1960 J. T. YOVANOVICH 2,941,453

INTERNAL wmomc MANDREL Filed July 9, 1957 5 Sheets-Sheet. 5

INVENTOR. JOSH/1 Z YOVA/VOV/CH United States Patent INTERNAL WINDING MANDREL Joseph T. Yovanovich, 1415 Orchard Way, Rosemont, Pa.

Filed July 9, 1957, Ser. No. 670,807

9 Claims. (Cl. 93-80) The present invention relates. to the mandrel of an internal winding machine and is concerned primarily with a mandrel designed to be used in the winding of paper strips into tubes.

An internal winding machine of the type with which this invention is concerned winds a paper strip that is impregnated with tar, asphalt, or other comparable composition into a tubular structure. The winding action takes place on a mandrel; and, from the very nature of the operation involved, the mandrel must have a rotative movement and also a rectilineal movement to impart the necessary helical formation to the strip. Machines heretofore provided for this purpose have been cumbersome, diflicult to manufacture, and lack that certainty and accuracy of operation that is required of such a machine.

With the foregoing conditions in mind, the present invention has in view as its foremost objective the provision of an internal winding mandrel that is compact in construction, may be easily manufactured, and operated with a high degree of surety and accuracy.

More in detail, the invention has as an object the provision of an internal winding mandrel that consists essentially of a core on which is slida-bly mounted for rectilineal reciprocation a plurality of slides the outer surfaces of which define the contour of the mandrel. Driving mechanism is provided for rotating the core to impart the necessary rotative movement to the mandrel; and additional driving mechanism is provided for reciprocating the slides so that at any one time all of the slides with a single exception move outwardly in one direction at a relatively low rate of speed while the remaining slide moves inwardly in the opposite direction at a comparatively high rate of speed. Inasmuch as the paper strip that is being wound is in frictional engagement with the larger number of slowly outwardly moving slides, the necessary rectilineal movement is imparted to the strip as it is wound into a tube.

Another object of the invention is to provide, in an internal winder of the character aforesaid, a plurality of cooperating slides as above noted each of which carries a cam roller, together with a cam that is rotatably mounted coaxially with the core and which cam has a cam track receiving the several rollers so that, upon rotation of the cam, the necessary rectilineal movement is imparted to the slides.

An internal winding mandrel of the type with which this invention is concerned must be susceptible of adjustment to vary the pitch of the helix that is formed thereon. By providing separate driving mechanisms for the core and cam, respectively, it is evident that, by varying the difierentia-l between the two speeds at which these members operate, the pitch or angle of the helix may be varied as desired.

From the foregoing, it is apparent that the slides constantly reciprocate on the core as the mandrel is in operation. This means that the sliding surfaces must be w ICC Patented June 21, 1960 properly lubricated. Moreover, inasmuch as the paper.

strip that is being wound is ordinarily impregnated with hot asphalt or tar, it is desirable, if not absolutelynecessary, that a oooling medium be applied to the internal surfaces of the tube immediately this is formed. With these factors in mind, a further object of the invention is to provide a combined cooling system for the formed tube and lubricating system for the mandrel slides This is achieved by forming the core with a plurality of radial openings which enter onto the sliding surfaces and posi-. tioning a tube within the core in spaced relation with respect to the bore thereof. A lubricant under pressure is delivered about the exterior of this tube and forced through the radial openings aforesaid to lubricate the helix into which the paper strip is wound. Thislend is achieved by providing the independent driving mechanisms for the cam on the one hand, and the core and slides on the other; 1

'Various other more detailed-objects and advantages of the invention, such as arise in connection with carrying out the above-noted ideas in a practical embodimennwill in part become apparent and in part be hereinafter stated as the description of the invention proceeds.

The invention therefore comprises an internal winding mandrel that consists essentially of a core having a plurality of rectilinealreciprocal' slides mounted thereon, together with driving mechanism for the core and driving mechanism for the slides in the form of a cam and associated cam rollers carried by the slides, with the core and cam being separately driven, together with a combined lubricating and coolingsystem for lubricating the slides and applying a cooling medium to the interior of the formed tube.

For a fulland more complete understanding of the invention, reference may be had to the following description and accompanying drawings, wherein:

Figure l is a vertical section through the internal winding mandrel of this invention with certain parts being shown in section and others in elevation;

Figure 2'is a top plan view;

Figure 3 is an end-elevation with the casing and supporting structure shown in section;

Figure 4 is a detailed vertical section through the cam This view is'taken housing and associated mechanism.- on an enlarged scale and about on the plane represented by the line 4-4 of Figure 3;

Figure '5 is another view taken on an enlarged scale and as a transverse section through the core and slides with certain parts broken away;

Figure 6 is a detailed longitudinal section through the core and slides and is taken on an enlarged scale and about 'on the plane represented by the line 6-6 of Figure 2;

Figure 7 is a transverse section through the core and slides and is taken about on the plane represented by'the line 77 of Figure 6;

Figure 8 is a longitudinalsection through the main head 7 of the combined lubricating and cooling system. This 1 view is taken on an enlarged scale and about on the plane I represented by the line 88 of Figure 2;

Figure 9 is a diagrammatic view depicting the cam track as laid out flat; and

Figure 10 is a detailed perspective illustrating one ofthe 3 slides and the manner in which it is connectedto the actuating cam;

Referring now to the drawings, wherein like reference characters denote corresponding parts, and first more particularly to Figures 1, 2, and 3, the internal winding mandrel of this invention is shown as being mounted on and within a supporting-casing which is referred to inits entirety by the reference character C. The casing C includes a rear wall that is formed with. an access opening 11, for a purpose to be later described, and which maynormally be closed by an appropriate closure (not illustrated). Mounted on this rear wall 10 is an appropriate source ofpower such as the electric motor indicated at 12.

The casing C also includes a front wall 13 formed with an opening at 14 which accommodates certain elements of'the slide assemblyto be later described. Extending between the rear wall 10 and front wall 13 are side walls 15 and 16.

A reservoir bottom is represented at 17;. and this bottom, together with the Walls 10, 13, 15, and 16, defines a reservoir 18 for a hydraulic medium, such as represented at 19; Above the reservoir 18'there is a supporting shelf 20 on which are mounted hydraulic pumps 21 and 22. These pumps 21 and 22 are driven from the drive shaft ofthe: motor 12through the medium of flexiblecouplings 23;and-24. A conduit shown at 25 extends down into the reservoir 18 and supplies the hydraulic medium to the pumps. 21 and 22.

As shown in Figures 1 and 3, there is anothersupporting, shelf 26 above the shelf 20; and carried by this shelf 26 are two. hydraulic motors 27 and 28. The hydraulic motor 27 isdriven from the pump 21; While the hydraulic motor 28 is driven from the pump 22. The conduits between the respective pumps and motors are not illustrated, as they are not particularly pertinent to this invention. It sufiices at this time .to point out that the hydraulic motor 28 is provided as a means for rotating the earn, as will be later described; while the hydraulic motor 27 rotatably drives the core and slides which are mounted thereon.

Mounted on the, shelf 26 is a support that may take rhetorm of a casting 29 which includes vertical members 30, 31, and 32. Mounted in the members 31 and 32 is a pair of bearing assemblies 33 and 34. The inner elements of these race assemblies 33 and 34 carry a driving sleeve 35 onwhichis drivably mounted a sprocket 36. Mounted on them mber 32 is an idler shaft which carries sprockets 37 and 38. A drive chain. 39 passes over the sprockets 36,. and 37; while. a. sprocket chain 40 passes over the sprock t 33v nd ano her sprocket 41 mounted on the drive shaft of the hydraulic motor 27. This system of sprockets and drive chains provides for a gear reduction between the drive shaft; of the hydraulic motor 27 and the drive sleeve 35.

A driving spindle 42tf0r thecam is shown as journaled withinthe drive sleeve 35 by a bearing assembly 43. that is' illustrated in Figure 1 and is'located at the end more closely adjacent to the rear Wall 10 and a second bearing assembly 44 that is illustrated in Figure 4. The driving spindle 42 drivably carries a sprocket 45; and a drive chain 46 passes over this; sprocket and another sprocket.

47 mounted onrthe drive shaft of the hydraulicv motor 28. hus the hydraulic. motor'28 is drivably connected to the spindle 42., A headt-hat; is referred to in its'entiretyby the reference character H is mounted in the vertical member 30 in a, manner to be later described in detail.

.I'hemandrelproper-is referred to inits entirety by the reference character M and projects outwardly from the front wall13, as shown in Figures 1' and; 2. This mandrel M is of appropriatelength, being in the natureof eight-- to ten fee nd. i hown asbroken. away to; permit ofillustration on the scale of the drawing Referringnowz more particularly to Figures 6 and: 7 the mandrel'M is shown as comprising a core 48. of tubular formation.

presid ng; a or -:49. I Slidab y mounted; on this core- 4 for rectilineal reciprocal movement is a plurality of slides each ofwhich'is referred to-in its entirety by the reference character S. In the form of the invention illustrated in the drawing, eight of the slides S are carried by the core 48. It is to be clearly understood that this exact number is not a limitation on the invention; and the number of slides may be varied without in any way departing from the spirit of the invention. Each-of the slides S includes an outer arcuatesurface, 5 0, wit h, the several arcuate surfaces 50 cooperating to define the cylindrical contour of the mandrel M. Each of the slides S; has a central longitudinally extending rib 51 that is received in a correspondingly shaped groove 52 that is formed in the outer surface of the core; 48.

Inasmuch as eight of the slides S are included in the assembly, the core 48 is shown as being octagonal in shape and defined by eight flat surfaces 53. The grooves or slots 52 open onto these flat surfaces 53. Each of the slides Shas a flat surface 54 on opposite sides of the rib 51; and these surfaces 54 are in sliding engagement with the surfaces 53. The bore 49 is formed with a required number of radial openings 55 which communicate between the bore 49- and the bottoms of the grooves 52 These openings 55 are provided for the purpose of delivering a lubricant to the sliding surfaces, as will be later described.

Each slide S carries at its inner endthat is, the end at the front wall 13a radially extending arm 56 (see Figure 10). Secured to each arm 56 adjacent to its outer free end is a pair of rods 57 and 58. Carried by each pair of rods 57 and 58 is a block assembly 59, with each block assembly 59 carrying a stub'shaft 60. Iournaled on the lower end of each stub shaft 60 is a cam roller 61.

Referring now more particularly to Figure 4, the driving spindle 42 is shown as having drivably mounted thereon through the medium of a key 62 a cam member 63 of generally cylindrical formation and formed with a cam track 64. All of the cam rollers 61 are received in the cam track 64; and whenever there is any relative rotative movement between cam member 63 and the rollers 6i a rectilineal movement is imparted to slides S.

Figure 9 shows the cam track 64 as'laid out flat; and it will be noted that this camtrack 64 includes a so-called return portion at 65 which is one-eighth the extent of the track 64. Asany one of the rollers 61 moves along this return portion 65, the slide S that is connected thereto is returned back towards the front wall 13. At the same time, the other seven rollers 61 will be traveling in the remainder ofthecam track 64 and be moved outwardly away from the-front wall 13. Thus, at all times, there are seven slides S that are moved outwardly at a relatively slow rate of speed; while a single slide is returned inwardly at a comparatively high rate of speed.

Referring now more. particularly to Figure 4, the driving sleeve35 is shown as carrying at one end an endplate 66 that is formed with a plurality of openings 67 which correspond in number tothe number of rods 57 and 58. These rods 57 and 58 extend into the openings 67; and their-reciprocating movement is accommodated by these openings. Secured to this endplate 66 is a housing 68. The housing 68, includes an inner end wall 69 that is bolted to the plate 6.6. as. by screw bolts 70, and an outer endwall 71 that is bolted, toythe cylindrical portion of the housing 63 by screw bolts 72. The inner and outer end walls 69 and '71 are formed-with aligned openings '73, which also align withthe openings, 67. These openings 73 are provided with bearing sleeves 74 which slidably receive the rods 57 and 58 and accommodate the reciprocating moveingthe housing- 638; or filling it with an appropriate lubrieating oil.

amass out toward the front beyond the bearing assembly 44 and is also journaled in another bearing assembly 77 that is mounted in an end closure 78 that is carried by the front wall 71. The spindle 42 terminates substantially flush with the outer face of this end closure 78.

The core 48 at its inner end is integrally connected to a dis'clike plate 79 that is secured to the front wall 71 of the housing as by screw bolts 80. Thus the core 48, as well as the slides S which are reciprocally mounted thereon, rotate with the housing 68 as a unit; and the latter is drivably connected to the driving sleeve 35.

Referring now more particularly to Figure 8, which will be considered in conjunction with the other views, it is noted that the head H is mounted in the vertical member 30 by means of screw bolts 81 which pass through openings formed in the flange 82.on a coupling member 83 that extends into the bore 84 formed in the socket head H. Thus the head H and coupling member 83 are held immovable against rotation.

The driving spindle 42 is tubular; and received in the bore thereof is an outer tube 85 that extends into the coupling member 83. This tube 85 extends throughout the length of the driving spindle 42 and terminates just short of the outer end thereof within the closure member 78, as shown in Figure 4.

It will be noted that the coupling member 83 has a bore at 86 and a counterbore at 87. The tube 85 is snugly received within this counterbore 87; while an inner tube 88 that is mounted within the tube 85 in spaced relation with respect to the bore thereof is received in the bore 86.

The coupling member 83 terminates short of the end of the socket 84, leaving a space 89. Beyond this space 89 the head H is formed with a bore 90 of the same diameter as the bore 86, and which bore receives the inner tube 88. This bore 90 is enlarged at 91 to accommodate packing 92, with the enlarged portion being threaded at 93 to accommodate a packing gland 94 that is carried by an operating member 95. The packing gland 94 and operating member 95 may be an integral unit formed with the bore 96 which receives the tube 88. The latter may be continued out beyond the operating member 95 and have its end formed as a handle 97. This end of the tube 88 is closed.

Within the space 89 the tube 88 is formed with a plurality of openings 98. The head H is formed with a threaded opening 99 that communicates with the space 89; and secured in this threaded opening 99 is a conduit 100 which is connected with an appropriate supply of a cooling medium such as water. It is evident that Water will pass from this conduit 100 into the space 89 and through the openings 98 into the tube 88. This tube 88 is continued out through the mandrel M, from which it projects a slight distance as shown in Figures 1, 2, and 6. Thus the cooling medium is delivered to the interior of the tube which is formed on the mandrel M.

A second conduit 101 has one end secured to the threaded portion of an opening 102 that is formed in the head H. The coupling member 83 is formed on its outer surface with an annular groove 103 and a plurality of radial passages 104 that communicate with this groove 103. Theouter tube 85 is formed with openings 105 in alignment with the openings 104. Thus, lubricating oil under pressure is delivered to'the space between the tubes 85 and 88. This space is identified by the reference character 106.

Upon referring to Figure 4, it will be noted that the space 106 communicates with the space about the tube 88 within the core 48. Thus the lubricating oil under pressure is delivered to the openings 55 and thence to the sliding surfaces on the mandrel.

In order to effectively guard against any possibility of water from the space 89 communicating with the lubricating oil, the outer surface of the coupling 83 is provided with sealing rings 107 and the bore 86 of this coupling with sealing rings 108 which engage the tube 88.

Moreover, it is evident that the packing gland 94 may be removed to permit of removal of the tube 88 and the insertion of a' substitute tube. After a tube 88 has been positioned, the packing gland 94 is tightened, which not only eifectivelyexpan-ds the packing 92 into sealing position, but also anchors tube 88 in position. Access to the handle 97 on the tube 88 is afforded by the access opening 11 in the rear wall 10, as shown in Figure l.

The free end of the mandrel M may be closed off by a cap member 109 as shown in Figure 6. This cap member 109 has a reduced skirt 110 which slides over reduced end portions 111 formed on the slides S. At the end of the bore 49 there is a ring 112 which receives the tube 88, with the latter projecting beyond this ring.

Operation While the mode of operation of the internal winding mandrel of this invention is believed to be obvious from the illustration of the drawings and description of parts given, it may be briefly outlined as follows. 7

The spindle 42 is driven at a comparatively high rate of speed by the hydraulic motor 28; while the driving sleeve 35 is driven at a slower rate of speed by the hydraulic motor 27 due to the gear reduction provided by the sprocket-and-chain assembly. This means that the cam 63 is driven at a higher rate of rotation than is the cam housing 68 and mandrel M that is connected thereto. Thus, while the necessary rotative movement is imparted to the mandrel M, the differential in the speeds of rotation between the cam 63 and housing 68 causes the rollers 61 to move in the' cam track 64. As this action takes place, seven of the slides S are moved outwardly at a comparatively low rate of speed; while a single slide S is returned inwardly at a high rate of speed. Inasmuch as the paper strip that is being wound into the tube frictionally engages all of the slides S, the frictional engagement with the seven slides that are moving outwardly more than overcomes the frictional engagement with the single slide moving inwardly, with the ultimate result that an outward rectilineal movement is imparted to the tube as it is formed on mandrel M. As this tube is formed and passes ofi the free end of the mandrel M, a cooling medium such as water is delivered and applied to the internal surface of the formed tube from the tube 88. Another tube (not illustrated) may apply the cooling medium to the outer surface of the formed tube. The cooling water is, of course, collected in a sump (not illustrated) and is returned to the cooling system. As the slides are continuously reciprocating, lubricating oil is applied to the sliding surfaces through the openings 55.

It is evident that by varying the differential in the speeds of rotation of the cam 63 and housing 68, variations may be had in the pitch of the helix of the tube that is formed on the mandrel M.

Perhaps the main advantage, from the practical viewpoint, of the mandrel of this invention is that it is susceptible of adjustment while in operation and actually producing tubing. This adjustment may be in either or both of two respects. In the first place, the angle of the helix being formed from the paper strip may be adjusted by varying the differential between the speeds at which the drive sleeve 35 and drive spindle 42 are driven. Secondly, the rate at which tubing is being formed or produced may be varied by adjusting the speed of both the drive sleeve 35 and spindle 42. In both cases the adjustment may be made while the machine is in operation.

While a preferred specific embodiment of the invention is hereinbefore set forth, it is to be clearly understood hat s claimed is:

n n n er al indin ma drel, a ubular: core, a y ind a h us oaxial th nd d ably onne t to oneend of said core, driving means for rotating said ousing, a pl rali y f sl e mounte n a d co f r longitudinal reciprocation thereon, a radially outstanding arm carried by each slide at the end adjacent to said housing, a rod connected to the outer end ot each arm and extending into said housing parallel to the axis thereof, a cam roller carried by each rod, a cam rotatably mounted within said housing coaxially therewith and having a cam track receiving said rollers, said cam track having a short return portion in which only one of said cam rollers is received at any one time, and. driving means for rotating said cam, the difierential in the speeds of rotation of said housing and cam causing relative movement between said cam rollers and said cam.

2. in an internal winding mandrel, a tubular core, a cylindrical housing coaxial with and drivably connected to one end of said core, driving means for rotating said housing, a plurality of slides mounted on said core for longitudinal reciprocation thereon, a radially outstanding arm carried by each slide at the end adjacent to said housing, a pair of rods connected to the outer end of each arm and extending into said housing parallel to the axis thereof, a cam roller carried by each pair of rods, a cam rotatably mounted within said housing coaxially therewith and having a cam track receiving said rollers, said cam track having a short return portion in which only one of said cam rollers is received at any one time, and driving means for rotating said cam, the difierential in the speeds of rotation of said housing and cam causing relative movement between said cam rollers and said cam.

3. In an internal winding mandrel, a tubular core, a cylindrical housing coaxial with and drivably connnected to one end of said core, a-drive sleeve connnccted to the endof said housing remote from the connnection-to said core, drive means operatively connected to said drive sleeve, a plurality of slides mounted on said core for longitudinal reciprocation thereon, a radially outstanding arm carried by each slide at the end adjacent to said housing, a rod connnccted to the outer end of each arm and extending into said housing parallel to the axis thereof, a cam roller carried by each rod, a cam rotatably mounted within said housing coaxially therewith and having a cam track receiving said'rollers, said cam track having a short return portion in which only one of said cam rollers .is received at any one time, a drive spindle connected to said cam and extending through said drive sleeve, and drive means operatively connnected to said drive spindle, the differential in the speeds of rotation of said housing and cam causing relative movement between said cam rollers and-said cam. I

4. In an internal windingmandrel, a tubular core having a bore and formed'with radial openings communicating with said 'bore, a plurality of slides mounted for longitudinalreciprocating movement on said core, a tube in said core spaced relative to the bore thereof, means for forcing a lubricantunder pressure into the space between-said tube and core, driving means for rotating said core with the slides thereon, and cam means for causing one of said slides to move rapidly in a return direction while the remaining slides move slowly in the opposite direction.

5. In'an-internal winder, a mandrel comprising a tubular'core of polygonal cross section :having a bore and a plurality of external fiat faces each of which has a longitudinal-groove opening thereinto, anda plurality of slides corresponding in number to the number of said flat faces, each of said slides having an innerfiat face in meeting engagement with aflat face of the core and formed with a longitudinal rib received in :thegroove of said face,

each of said slides having an outer arcuate surface with fine acylinder.

e. In an internal winder, a mandrel comprising a tubular core of polygonal cross section having a bore and a plurality of external flat faces each of which has a longitudinal groove opening thereinto, said core being formed with openings communicating between said bore and the bottoms of said grooves, and a plurality of slides corresponding in number to the number of said fiat faces, each of said slides having an inner flat face in meeting engagement with a fiat face of the core and formed with a longitudinal rib received in the groove of said face, each of said slides having an outer arcuate surface with the arcuate surfaces of all the slides cooperating to define a cylinder.

7. in an internal winding mandrel, a tubular core, a cylindrical housing coaxial with and ,driv-ably connected to one end of said core, driving means forrotating said housing, eight slides mounted on said core for longitudinal re ciprocation thereon, a radially outstanding arm carried by each slide at the end adjacent to said housing, a rod connected to the outerrend of each arm and extending into said housing parallel to the axis thereof, a cam roller carried by each rod, a cam rotatably mounted within said housing ,coaxially therewith and having a cam track receiving said rollers, said cam track having a short return portion in which only oneof said cam rollers is received at any one time, and driving means for rotating said cam, the difierential in the speeds of rotation of said housing and cam causing relative movement between said cam rollers and said cam.

8. in an internal Winding mandrel, a tubular vcore having a bore and for-med with radial openings communicatingwith saidbore, a plurality of .slides'mounted for longitudinalreciprocating'movemcnt on said core, atube in said core spaced relative to the bore thereof, means for forcing alubticant under pressure into the space between said tube and core, means for introducing a cooling medium under pressure into said tube, driving means for rotating said core with the slides thereon, and cam means for causing one of said slides to move rapidly in a return direction while the remaining slides move slowly in the opposite direction.

9. In an internal winding mandrel, a tubular core, a cylindrical housing coaxial with and drivably connected to one end of saidcore, adjustable driving means for rotating said housing, a plurality of slides mounted on said core for longitudinal reciprocation thereon, a radially outstanding arm carried by each slide at the end adjacent to said housing, a pair of rods connected to the outer end of each arm and extending into said housing parallel to the axis thereof, scam roller carried by each pair of rods, a cam rotatably=mounted within said housing coaxially therewith andhavinga cam track receiving said rollers, said cam track having a short return portion in which only one of said cam roliers'is received at any one time, driving means for rotating said cam, the differential in the speedso-f rotation of said housing and cam causing References Cited in theifile of this patent- ,UNITED STAIESPATENTS 1,682,045 Hollmann Aug. 28, 1928 1,814,697 Hollmann Julyll4, 1931 2,146,305 Link Feb. 7, 1939 2,828,239

Fischer Mar. 25, 1958 

